A dual-polarized quasi-optical SIS mixer at 550 GHz
A dual-polarized quasi-optical SIS mixer at 550 GHz
复制标题
550 GHz 的双偏振准光 SIS 混频器
DOI：
10.1109/22.873895
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Zmuidzinas
中科院分区：
文献类型：
--
作者：
G. Chattopadhyay;D. Miller;H. Leduc;J. Zmuidzinas
在本文中，我们描述了一个低噪声的双极化准光超导体-绝缘体-超导体（SIS）混频器的设计，制造和性能在550 GHz。该混频器采用了一种新的交叉槽天线的超半球形基板透镜，两个结调谐电路，铌三层结，和一个IF电路包含一个集总元件180/spl度/混合。该天线由一对正交的双槽天线组成，并有四个馈电点，每个极化两个。每个馈电点都耦合到两结SIS混频器。180/spl deg/ IF混合电路使用位于混频器块内部的集总元件/微带电路实现。混频器频率响应的傅里叶变换光谱仪测量结果与计算机模拟结果吻合良好。测量的两种偏振的共偏振和交叉偏振模式也与理论预测一致。双极化混频器的噪声性能非常出色，在528 GHz时，两种极化的未校正接收机噪声温度均优于115 K（双边带）。
In this paper, we describe the design, fabrication, and the performance of a low-noise dual-polarized quasi-optical superconductor-insulator-superconductor (SIS) mixer at 550 GHz. The mixer utilizes a novel cross-slot antenna on a hyperhemispherical substrate lens, two junction tuning circuits, niobium trilayer junctions, and an IF circuit containing a lumped element 180/spl deg/ hybrid. The antenna consists of an orthogonal pair of twin-slot antennas, and has four feed points, two for each polarization. Each feed point is coupled to a two-junction SIS mixer. The 180/spl deg/ IF hybrid is implemented using a lumped element/microstrip circuit located inside the mixer block. Fourier transform spectrometer measurements of the mixer frequency response show good agreement with computer simulations. The measured co-polarized and cross-polarized patterns for both polarizations also agree with the theoretical predictions. The noise performance of the dual-polarized mixer is excellent giving uncorrected receiver noise temperature of better than 115 K (double sideband) at 528 GHz for both the polarizations.